The backend layer
Behind the application we are likely to find a database cluster of some sort. For this example, we have chosen RDS (MySQL/PostgreSQL). However, the scaling and resilience ideas can be easily translated to suit a custom DB cluster on EC2 instances.
Starting with high-availability, in terms of RDS, the feature is called a Multi-AZ deployment. This gives us a Primary RDS instance with a hot STANDBY replica as a failover solution. Unfortunately, the Standby cannot be used for anything else, that is to say we cannot have it, for example, serving read-only queries.
A Multi-AZ setup within our VPC would look like this:
In the case of a ...
Get Implementing DevOps on AWS now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
